Just been tearing my hair out trying to parent some facial features (polyhair, facial hair, eyeballs etc) to character armature.
Since the DEF bones were hidden I was trying to do it in the relations panel, and had things flying in all sorts of directions and deforming very strangely.
I saw a suggestion somewhere that this could cause probs, so I made the DEF bones visible and did ctrl-P–bone in the 3d view. All OK.
Should I report this as a bug? It nearly made my head explode :spin::spin: